Transformer winding



Sept. l, 1925. v 1,552,007

J. F. PETERS TRANSFORMER WINDING Filed June 5, 1921 wlTNEssEs: 290 INVENTOR ATTORNEY Patented Sept. 1, 1925.

UNITED STATES PATENT oFFlcE.

JOHN' F. PETERS, OF -EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR T0 'WESTING-f HOUSE ELECTRIC & MANUFACTURING COIIPANY, A CORPORATION OF PENNSYL- VANIA.

mnANsroRMnn WINDING.

Appiication med June a, 1921. serial No. 474,788.

To. all whom it may concern.' Y

- Be it known that I, JOHN F. PETERS, a citizen ofthe United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Transformer Windings, of which the following is a specification.

My invention relates to transformers and it has particular relation toa novel arrang-ef ment of windings therefor.

The object of my invention is to provide an arrangement of windings whereby the proportion of the total space occupied by the windings and insulation with respect tothe space occupied by the active current carrying conductor in a'transforiner is reduced to a minimum.

In the construction of transformers,I

has been found advisable to' make the'high tension coils 4embracethe low tension coils closely. In winding transformers, `1t has been customary to mount separate high ten` sion windings on the individual legs of the core. In some instances, the mid-point of the high tension windings on each leg is connected to a wsource of potential and the end portions. thereof are connected to` ground.'y

This connection permits' of symmetrical dis tribution of insulation and results in two parallel current paths on each leg of thetransformer. As each transformer has at least two legs, the hightension current must be divided into at least four paths. As each of these current paths has the full potential of the line to which itis connected impressed thereon, the insulation between the winding coils and the core and between adjacent turns of the same winding will be independent of the current carried thereby.v

By means of my invention, I provide an arrangement -of coils whereby a core having a plurality oflegs is provided with a high tension winding which consists of but two parallel paths of relatively heavy 'cross-sectionalV area of which the high tension winding closely embraces the -low tension wind-- ing. In such construction, theamount of insulation between the high tension and low tension windings is unchanged but the thickness of insulation between the adjacent turns 'In the accompanying drawin Figure l -is a' cross-sectiona view of ya transformer constructed in accordance'with my invention, ortions thereofbeing omitted for the sake of) clearness.

Fig. 2 is a diagrammatic view of the structure illustrated in Fig. 1. In the drawings, I show a transformer core 3 provided with two legs 4 and 5, respectively. Upon the leg 4 is mounted a plurality of coils 6 and the leg 5 is likewise provided with a Lplurality of coils 7. The vcoils 6 and 7 constitute the high tension winding, the low tension winding is shown in two sections lirland 5b mounted on the legs 4 and 5, respectively..

The coils 6 and 7 are connected in series alternately by means of connections 8. The mid-point 9 of the winding` thus formed is connected' to a source of potential from which the energy is derived and the end portions. 10 thereof are connected to ground as indicated at l1. The high tension current is thusdivided into two paths, both of which are evenly distributed about all the'legs of the core member. l

In. the event that the transformer core has more than two legs, the coilswould be recurrently wound upon each of said legs successively, in the manner herein described in' connection with acore of but two legs, the

lcoils near the midpoint of the leg being alwaysmaintained at a higher potential than are those near the end of the legs. This conl transformer core: When the number of curi rent paths is maintained at a minimum, the cross-.sectional area of the conductors employed A must .necessarily .be large. .The amount of insulation necessary for properly insulating the hightension turns over the low tension .turns is independent of the size of conductors. However, by the use of my invention, the thickness of. insulation required between the individual turns of the high potential winding is greatly reduced and the space factor of the transformer is thereby reduced to a minimum.

While I have shown but a single embodiment of my invention, further changes and modifications ma be made therein without departing from the spirit and scope thereof,

" and I desire, therefore, that only such limitations shall be placed thereupon as are nnposed by the prior art or are specifically set forth in the appended claims.

I claim as my invention: M

l. In a transformer, a core member rovided with a; pluralit of legs, a win ing successively recurrent y wound upon said plurality of legs, the ends of said winding being maintained at roundv potential, and substantially the midpoint thereof being connected to a source of electrical energy.

2.-,In a transformer, a core member provided with a plurality of legs, aplurality of coils disposed upon said legs, the coils of said legs beingl connected in series alternately, the coils adjacent top-the midpoints of said legs being connected to a source of 'potential and the coilsadjacent the ends thereof bei-ng maintained at substantially ground potential. V 3. In a' transformer, a terminal therefor, a core member having a plurality of legs and a plurality of coils on each of said l said coils being connected in two paral el groups betweensaid terminal and a point of ground potential, each of said groups consisting of a plurality of coils on each of said legs connected alternately'in circuit.

4. In stationary induction apparatus, the combination with a core having a plurality of winding legs, of a winding on each of said legs, a line terminal vconnected to intermediate points of all -of said windings, and cross-connectionsconnecting portions of all of said` windings in series `at each side of said intermediate points, whereby tw'o 'similar paths inmulti le leading from said lineterminal are esta lished in said windlngs. p v

5. In stationary induction apparatus, the combination witha core having two winding legs, of a plurality of groups of winding turns on each of said winding legs, two of said groups of turnsnear opposite ends of said core being-connected to ground to provide one terminal of the apparatus, al highvoltage terminal connected to twoof said' vgroups of turns,.eahh of said latter groups of turns being separated from the ends of said core 'by groups of turns of lower voltage means connectingm series groups of turns on both of said winding legs between7 one of said grounded groups and one of said high-voltage groups, and means connecting 1 in series groups of turns on both of said winding legs .between the other of said grounded groupsl and the other of said highvoltage groups.

6. In stationary induction apparatus, the

combination with a core having two winding legs, of a plurality of groups of wind- .ing turns on each of said winding legs, cross 4connections connectlng sald groups of turns in series, said'groups beingl disposed alter- -nately on said windingfle'gs, the two end c'ombinationvwith a core having two .winding legs, of a plurality of groups of winding turns on each .ofsaid winding-legs cross connections connecting said groups of turns in series, said groups being disposed alternately on said winding legs with the two end groups near opposite yokes of the core, saidy two end groups being grounded to provide one transformer terminal, and a second transformer terminal connected to` said series connectedgroups of turnsv near the center"l thereof.

8. In stationary induction apparatus, the combination with a core having a plurality of winding legs, of a winding on. each of said legs, a single line terminal connected to 'the central points of all of said windings,

and cross connections for connecting portions of thewinding .on each leg in series with portions on every other leg at each side of said central points, whereby two similar paths in. multiple Kfor the" current Vare estabtions whereby two similar paths in multiple are established, each path traversing portions of the `high voltage winding on each leg.g

In 'testimony whereof, Ihave` hereunto sbscribed my name this 26th dayv of May,

JOHN F. PETERS. 

